16404231 has 8 divisors (see below), whose sum is σ = 21892480. Its totient is φ = 10926072.

The previous prime is 16404229. The next prime is 16404247. The reversal of 16404231 is 13240461.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 16404231 - 2¹ = 16404229 is a prime.

It is a super-2 number, since 2×16404231² = 538197589402722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16404198 and 16404207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16404251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3006 + ... + 6468.

It is an arithmetic number, because the mean of its divisors is an integer number (2736560).

Almost surely, 2^16404231 is an apocalyptic number.

16404231 is a deficient number, since it is larger than the sum of its proper divisors (5488249).

16404231 is a wasteful number, since it uses less digits than its factorization.

16404231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5045.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 16404231 is about 4050.2136980658. The cubic root of 16404231 is about 254.0886653895.

Adding to 16404231 its reverse (13240461), we get a palindrome (29644692).

The spelling of 16404231 in words is "sixteen million, four hundred four thousand, two hundred thirty-one".